I went to an Indy shop that specializes in high end cars and heard another opinion on oil for the M3. They don't recommend the Castrol TWS because it doesn't meet German specs; only US specs. They say it lacks zinc because of the following reason. Iffff, the vehicle begins to eat oil, it would likely cause problems with the catalytic converters. They said the lack of the zinc results in more sludge and engine wear and that is what theyve witness with the Castrol TWS! So they use two oils they highly recommend and I only recall one for certain and it is Elf (I think the other was Moly or Mobil but I am uncertain). Elf is what they recommend for my M.
Interesting huh? I know, I certainly am not excited to experiment, but that was what they said.
Any thoughts fam?
Edit: Why recommend that zinc be removed from which wears more on the engine in favor of cats? Possibly to avoid the need to replace cats within 100K mile warranty for emissions components. Again, just sharing what I heard today :-)
Last edited by L4ces; 02-18-2013 at 04:17 PM.
Reason: Additional info